U.S. patent number 3,720,840 [Application Number 05/186,860] was granted by the patent office on 1973-03-13 for wind turbine generator with exhaust gas heater.
Invention is credited to Hendrick J. Gregg.
United States Patent |
3,720,840 |
Gregg |
March 13, 1973 |
WIND TURBINE GENERATOR WITH EXHAUST GAS HEATER
Abstract
A gas turbine driven electric generator system is provided which
makes it possible to utilize wind as the motive force and to reduce
or eliminate pollution.
Inventors: |
Gregg; Hendrick J. (Denver,
CO) |
Family
ID: |
22686559 |
Appl.
No.: |
05/186,860 |
Filed: |
October 6, 1971 |
Current U.S.
Class: |
290/55; 60/398;
290/44; 60/682; 415/4.3 |
Current CPC
Class: |
F03D
9/37 (20160501); F03D 9/25 (20160501); F03D
80/00 (20160501); F02C 1/02 (20130101); F02C
6/00 (20130101); Y02E 10/725 (20130101); Y02E
10/728 (20130101); Y02E 10/722 (20130101); Y02E
10/72 (20130101); F05B 2240/131 (20130101) |
Current International
Class: |
F03D
1/04 (20060101); F03D 1/00 (20060101); F02C
6/00 (20060101); F02C 1/00 (20060101); F02C
1/02 (20060101); F03d 009/00 () |
Field of
Search: |
;60/59T
;290/43,44,54,55 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Simmons; G. R.
Claims
The invention is hereby claimed as follows:
1. An electric generator system comprising an electric generator, a
gas operated turbine drivingly connected to said generator, a gas
receiver on the inlet side of said turbine, a wind inlet stack
connected at its exit end to said gas receiver, inlet means for
wind at the entrance end of said stack, an exhaust stack connected
at its entrance end to the exhaust side of said turbine and adapted
to discharge exhaust gases through its exit end, and means in said
exhaust stack for heating said exhaust gases to enhance the
flow.
2. A system as claimed in claim 1 comprising means at the outer end
of said inlet stack for capturing gases moving in a substantial
horizontal direction.
3. A system as claimed in claim 2 in which said means for capturing
gases swivels on said stack and contains vanes adapted to adjust
the position of said means in the direction of maximum gas
flow.
4. A system as claimed in claim 1 comprising means at the exit end
of said exhaust stack for discharging exhaust gases in a
substantial horizontal direction.
5. A system as claimed in claim 1 in which said means for
discharging gases swivels on said exhaust stack and contains vanes
adapted to adjust the position of said means in the direction of
maximum gas flow.
6. A system as claimed in claim 1 in which said exhaust stack is
adapted to carry a larger volume of gas than said inlet stack.
7. A system as claimed in claim 1 comprising means to control the
flow of gases in said system.
8. A system as claimed in claim 1 in which said inlet stack
contains a damper ahead of said receiver, a passageway connects
said inlet stack to said exhaust stack at a point between said
damper and said inlet means, and said passageway contains a
damper.
9. A system as claimed in claim 8 comprising means to control the
operation of said dampers in response to gas requirements of said
turbine.
10. A system as claimed in claim 1 in which said generator is
connected through clutch means to a stand-by prime mover and the
exhaust from said prime mover is connected to said exhaust stack.
Description
BACKGROUND
Various attempts have been made to utilize wind as a motive force
for generating electric power. Most of the devices that have been
proposed are so-called windmills in which a propeller is driven by
the wind and the shaft on which the propeller is mounted is
drivingly connected to a generator. U.S. Pat. No. 2,004,853 gives
an illustration of such an air operated power unit.
In U.S. Pat. No. 695,524 a fan or propeller connected to an
electric generator is driven by suction from a vertical flue in
which the air is heated. This type of device, however, does not
attempt to capture wind and cannot create a very large gas velocity
without employing a relatively large heat input.
It would be desirable to provide an electric generator system in
which the natural wind currents are captured and utilized as a
motive force. It would also be desirable to provide a system of the
type described, the operation of which leads to the reduction or
practical elimination of air pollution.
OBJECTS
With the foregoing desiderata in mind, one of the objects of the
present invention is to provide a gas turbine driven electric
generator system which makes it possible to capture and utilize
wind as the gaseous motive force and to reduce or practically
eliminate pollution of the air.
Another object of the invention is to provide a system of the type
described in which the flow of gases in the system is
controlled.
A further object of the invention is to provide a system of the
type described in which auxiliary equipment is provided to take
care of contingencies attributable to variations in wind
velocity.
THE DRAWINGS
Other objects and advantages of the invention will appear from the
following description in conjunction with the accompanying drawings
in which:
FIG. 1 represents a side elevational view of an embodiment of the
invention; and
FIGS. 2 and 3 are diagrammatic views illustrating operational
controls provided in accordance with the invention.
BRIEF SUMMARY OF THE INVENTION
In accordance with the invention an electric generator system is
provided comprising an electric generator, a gas operated turbine
drivingly connected to said generator, a gas entrance receiver on
the inlet side of said turbine, an inlet stack connected at its
exit end to said gas receiver, inlet means for gas at the entrance
end of said stack, an exhaust stack connected at its entrance end
to the exhaust side of said turbine and adapted to discharge
exhaust gases through its exit end, and means in said exhaust stack
for heating said exhaust gases.
In the practice of the invention the exhaust stack is normally
adapted to carry a larger volume of gas than the inlet stack. The
system provided in accordance with the invention preferably
comprises means at the entrance end of the inlet stack for
capturing gases moving in a substantial horizontal direction and
adapted to adjust to the direction of maximum gas flow. The system
also preferably comprises means at the exit end of the exhaust
stack for discharging exhaust gases in a substantial horizontal
direction and adapted to adjust to the direction of maximum gas
flow. In addition, the system preferably comprises means to control
the flow of gases in response to gas requirements of the turbine.
Finally, the system preferably comprises means for operating the
electric generator on a stand-by basis when the gas requirements
furnished by wind flow are insufficient.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, the embodiment illustrated comprises an inlet
stack generally shown at 1 and an outlet stack generally shown at 2
connected by a passageway generally shown at 3.
The inlet stack 1 is provided with a funnel-shaped entrance end 4
adapted to capture wind 5 moving in a substantial horizontal
direction. The end 4 is connected to an elbow 6 which contains a
vane 7 and is mounted on a swivel 8. Vane 7 will cause end 4 of
inlet stack 1 to swivel and to maintain a position where the
maximum wind velocity will be captured by inlet end 4.
Passageway 3 contains a damper 9 which is normally closed and the
inlet stack 1 contains a damper 10 which is normally open so that
wind entering inlet stack 1 will pass to a receiver 11 and thence
to a gas turbine 12. The gas turbine 12 is mounted with a through
shaft 13 supported by suitable bearings 14,14 and connected through
a clutch 15 to an electric generator 16. Thus, the rotation of the
vanes in multistage turbine 12 drives electric generator 16 and the
electricity generated is removed through cables 17 to a suitable
storage system, for example, storage batteries, not shown.
In order to increase the efficiency of the operation, a heating
unit 18 is disposed in exhaust stack 2 and the heat thereby
provided accelerates the flow of gases through the outlet 19 of the
exhaust stack 2. The exit end 19 is connected by an elbow 20 to a
swivel mechanism 21 and is provided with a vane 22 which controls
the position of exit end 19 in accordance with the wind velocity
and causes the exhaust gases to be discharged in the direction of
wind flow. The heating unit 18 can be, for example, an electrical
heating unit or a gas heating unit in which the gases of combustion
are also discharged into the exhaust stack and tend to accelerate
the suction effect created by the flow of gases discharged from the
exhaust stack.
A stand-by prime mover, e.g., a gas turbine or a steam turbine or
an internal combustion engine is provided as auxiliary equipment in
case the variation in wind flow does not permit the usual operation
of this system. For example, internal combustion engine 23 is
connected through shaft 24 and clutch 25 to generator 16 and the
exhaust pipe 26 is connected to exhaust stack 2.
In normal operation clutch 15 is engaged and clutch 25 is
disengaged. In stand-by operation when internal combustion engine
23 is used, clutch 15 is disengaged and clutch 25 is engaged.
Damper 9 is capable of movement from the vertical or closed
position to a horizontal or fully open position or to any
intermediate point by being mounted on a shaft 27 connected to
piston rod 28 by link 29, rod 28 being connected to a piston in
cylinder 30. Similarly, damper 10 is mounted for rotation on shaft
31 which is connected to piston rod 32 by link 33, rod 32 being
connected to a piston in cylinder 34.
Optionally, a governor 35 is provided to control the speed of gas
turbine 12 and is connected to gas turbine 12 by a shaft 36 through
coupling 37 and bearing 14 which is mounted on a suitable
supporting structure.
A clean-out plate 39 is provided at the lower end of receiver
11.
The operation of dampers 9 and 10 is illustrated diagrammatically
in FIGS. 2 and 3. As shown in FIG. 2, in the usual operation when
wind is blowing through inlet opening 4, damper 9 is closed and the
piston 40 in cylinder 30 is retracted. At the same time damper 10
is open and the piston 41 in cylinder 34 is retracted. Both pistons
are operated from a piston valve 42 connected to receiver tank
38.
When the wind velocity becomes excessive, damper 9 is automatically
opened and damper 10 is closed due to the fact that fluid from the
piston valve 42 causes pistons 40 and 41 to be advanced. The excess
wind then spills through passageway 3 to the exhaust stack 2.
The stem 43 of piston valve 42 is connected to governor 35 and is
movable axially in response to the speed of rotation of shaft 36
connected to turbine 12. When the fly balls 44 of governor 35 are
collapsed as is the case when the speed of rotation is not
excessive, the valve stems 43 will be down and dampers 9 and 10
will occupy the positions shown in FIG. 2. On the other hand, when
fly balls 44 are expanded due to excessive speed of rotation of
turbine 12 valve stem 43 will be up and the dampers 9 and 10 will
occupy the positions shown in FIG. 3.
The size of the stacks 1 and 2 will vary depending upon conditions.
Thus where a system of this type is used on a ship they will be
relatively short. On the other hand, in a stationary land location,
the cold intake stack 1 could be 10 feet in diameter by as much as
100 feet high and the warm exhaust stack 2 could be 14 feet in
diameter by as much as 130 feet high. The average diameter of the
multi-stage turbine wheels could be around 12 feet or larger.
It will be recognized that various other types of speed control
devices can be used to protect the system against vibration and
high winds. Thus, an electrical control system using limit switches
and solenoid valves might be employed instead of the type of system
illustrated in the drawings. Various devices can be used to start
and/or stop heating element 18 in exhaust stack 2. Suitable devices
can also be used to start stand-by engine 23 in case of
insufficient wind velocity. Other devices can be used to cut off
the flow of electricity through lines 17 when the batteries are
fully charged and magnetic clutches can be employed at 15 and 25 to
engage and disengage the operating shafts to generator 16 when
required.
The invention makes it possible to utilize wind currents in order
to generate electricity which can be stored and used as required.
The invention also makes it possible to generate electricity
without polluting the atmosphere or with a minimum of atmospheric
pollution.
* * * * *